Android Build Tools

Android/android-ndk-r27d/sources/android/ndk_helper/tapCamera.h

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+/*
+ * Copyright 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <vector>
+#include <string>
+#include <GLES2/gl2.h>
+
+#include "JNIHelper.h"
+#include "vecmath.h"
+#include "interpolator.h"
+
+namespace ndk_helper
+{
+
+/******************************************************************
+ * Camera control helper class with a tap gesture
+ * This class is mainly used for 3D space camera control in samples.
+ *
+ */
+class TapCamera
+{
+private:
+    //Trackball
+    Vec2 vec_ball_center_;
+    float ball_radius_;
+    Quaternion quat_ball_now_;
+    Quaternion quat_ball_down_;
+    Vec2 vec_ball_now_;
+    Vec2 vec_ball_down_;
+    Quaternion quat_ball_rot_;
+
+    bool dragging_;
+    bool pinching_;
+
+    //Pinch related info
+    Vec2 vec_pinch_start_;
+    Vec2 vec_pinch_start_center_;
+    float pinch_start_distance_SQ_;
+
+    //Camera shift
+    Vec3 vec_offset_;
+    Vec3 vec_offset_now_;
+
+    //Camera Rotation
+    float camera_rotation_;
+    float camera_rotation_start_;
+    float camera_rotation_now_;
+
+    //Momentum support
+    bool momentum_;
+    Vec2 vec_drag_delta_;
+    Vec2 vec_last_input_;
+    Vec3 vec_offset_last_;
+    Vec3 vec_offset_delta_;
+    float momemtum_steps_;
+
+    Vec2 vec_flip_;
+    float flip_z_;
+
+    Mat4 mat_rotation_;
+    Mat4 mat_transform_;
+
+    Vec3 vec_pinch_transform_factor_;
+
+    Vec3 PointOnSphere( Vec2& point );
+    void BallUpdate();
+    void InitParameters();
+public:
+    TapCamera();
+    virtual ~TapCamera();
+    void BeginDrag( const Vec2& vec );
+    void EndDrag();
+    void Drag( const Vec2& vec );
+    void Update();
+
+    Mat4& GetRotationMatrix();
+    Mat4& GetTransformMatrix();
+
+    void BeginPinch( const Vec2& v1, const Vec2& v2 );
+    void EndPinch();
+    void Pinch( const Vec2& v1, const Vec2& v2 );
+
+    void SetFlip( const float x, const float y, const float z )
+    {
+        vec_flip_ = Vec2( x, y );
+        flip_z_ = z;
+    }
+
+    void SetPinchTransformFactor( const float x, const float y, const float z )
+    {
+        vec_pinch_transform_factor_ = Vec3( x, y, z );
+    }
+
+    void Reset( const bool bAnimate );
+
+};
+
+} //namespace ndkHelper